Auto merge of #42398 - redox-os:master, r=sfackler

Redox: Switch to repr(C) for syscall structs

src/libstd/sys/redox/syscall/data.rs

@@ -12,7 +12,7 @@ use core::ops::{Deref, DerefMut};
 use core::{mem, slice};
 
 #[derive(Copy, Clone, Debug, Default)]
-#[repr(packed)]
+#[repr(C)]
 pub struct Stat {
     pub st_dev: u64,
     pub st_ino: u64,
@@ -51,7 +51,7 @@ impl DerefMut for Stat {
 }
 
 #[derive(Copy, Clone, Debug, Default)]
-#[repr(packed)]
+#[repr(C)]
 pub struct StatVfs {
     pub f_bsize: u32,
     pub f_blocks: u64,
@@ -79,7 +79,7 @@ impl DerefMut for StatVfs {
 }
 
 #[derive(Copy, Clone, Debug, Default)]
-#[repr(packed)]
+#[repr(C)]
 pub struct TimeSpec {
     pub tv_sec: i64,
     pub tv_nsec: i32,